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Articles 31 - 32 of 32
Full-Text Articles in Mining Engineering
Stochastic-Optimization Of Equipment Productivity In Multi-Seam Formations, Elijah Adadzi
Stochastic-Optimization Of Equipment Productivity In Multi-Seam Formations, Elijah Adadzi
Masters Theses
"Short and long range planning and execution for multi-seam coal formations (MSFs) are challenging with complex extraction mechanisms. Stripping equipment selection and scheduling are functions of the physical dynamics of the mine and the operational mechanisms of its components, thus its productivity is dependent on these parameters. Previous research studies did not incorporate quantitative relationships between equipment productivities and extraction dynamics in MSFs. The intrinsic variability of excavation and spoiling dynamics must also form part of existing models. This research formulates quantitative relationships of equipment productivities using Branch-and-Bound algorithms and Lagrange Parameterization approaches. The stochastic processes are resolved via Monte …
Extension Of Thickness-Dependent Dielectric Breakdown Law On Adiabatically Compressed Ferroelectric Materials, S. I. Shkuratov, Jason Baird, E. F. Talantsev
Extension Of Thickness-Dependent Dielectric Breakdown Law On Adiabatically Compressed Ferroelectric Materials, S. I. Shkuratov, Jason Baird, E. F. Talantsev
Mining Engineering Faculty Research & Creative Works
It is experimentally found that the Eb(d) = γ · d -ξ law describing the thickness-dependent breakdown electric field for solid dielectrics at ambient conditions can be extended for dielectrics in other thermodynamic states. It follows from the experimental results reported herein that the breakdown field, Eb(d), of Pb(Zr₀.₉₅Ti₀.₀₅)O₃ (PZT 95/5) and Pb(Zr₀.₅₂Ti₀.₄₈)O₃ (PZT 52/48) ferroelectrics subjected to explosive adiabatic compression obeys the above-mentioned law in a wide range of voltages, up to 150 kV.